Question: Whats a strange thing people don’t usually know about diseases?

Lucy McGowan answered on 18 Jun 2020:

Did you know that gravity has a big impact on our physical health? That’s because we are adapted to life on earth, with gravity pulling us down. We need strong hearts to make sure our blood doesn’t pool at our feet and strong bones that can withstand the forces our bodies experience due to gravity. So what happens when astronauts leave earth for months to live on the space station? Microgravity is an environment, like the at the space station, where there is very little gravitational force compared to earth. This is what allows astronauts to float around. However, without gravity to pull them down, the astronauts’ hearts become lazy, their muscles waste and their bones become very weak! Astronauts have to do lots of exercise on the space station to combat this. However when they return to earth they must undergo physical rehabilitation to make their bodies strong again. Some astronauts even suffer from diseases such as osteoarthritis and osteoporosis at a younger age compared to other people due to their long-term exposure to microgravity.